A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The F1 plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F1 × F1 cross?
A. 1:2:1
B. 2:1
C. 3:1
D. 9:3:3:1
C. 3:1
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For sexually reproducing organisms, a species
consists of a. individuals sharing a habitat. b. a group of reproductive females. c. populations that have the potential to interbreed and produce fertile offspring. d. individuals that have the same nutritional requirements. e. individuals in the same geographical range with similar ecological requirements.
The distribution of the human population in the
United States is a. clumped. b. random. c. uniform. d. constant. e. homogeneous.
What is the best evidence that all life evolved from prokaryotic rather than eukaryotic ancestors?
A. Bacteria are unicellular. B. Prokaryotes possess peptidoglycan in their cell walls. C. The oldest fossil form of life known is prokaryotic. D. Prokaryotes possess flagella.
It is now a routine task to determine the exact order in which individual subunits have been linked together in polynucleotides (DNA) and polypeptides (proteins)
However, it remains difficult to determine the arrangement of monomers in a polysaccharide. Explain why this is the case.